Horizontal Rhythm

The standard Bootstrap grid is a 12 column layout, with a 15px margin on each side of the column, resulting in a 30px gutter between columns plus 15px to the left and right of the grid. 

The entirety of the grid is called Container. A container can be either fluid or responsive in size. A fluid container will always take the whole available width.

• Customising for a desktop: Each column should be 72px wide, with a gutter of 24px or 32px.
• Designing for mobile is up to you: Not all mobile devices' width dimension is divisible by 8. 12 columns aren't practical for narrow screens.